fish-shell/doc_src/help.txt

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\section help help - display fish documentation
\subsection help-synopsis Synopsis
<tt>help [SECTION]</tt>
\subsection help-description Description
The \c help command is used to display a section of the fish help documentation.
If the BROWSER environment variable is set, it will be used to display the
documentation, otherwise fish will search for a suitable browser.
Note also that most builtin commands display their help in the terminal when
given the <tt>--help</tt> option.
\subsection help-example Example
<tt>help fg</tt> shows the documentation for the \c fg builtin.